body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.timer-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    border-radius: 5px;
    animation: fadeIn 0.5s ease-in-out; 
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

h1 {
    font-size: 24px;
}

.controls {
    margin-top: 20px;
}

label {
    font-size: 16px;
    margin-right: 10px;
}

input {
    width: 60px;
    padding: 5px;
    font-size: 16px;
}

button {
    font-size: 16px;
    padding: 5px 10px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
}

button:hover {
    background-color: #333;
    color: #fff;
}

.timer-display {
    margin-top: 20px;
    font-size: 24px;
    font-weight: bold;
    animation: fadeIn 0.5s ease-in-out; 
}
.timer-display.running {
    animation: bounce 0.5s ease-in-out; 
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.timer-display.stopped {
    animation: shake 0.5s ease-in-out; 
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}